ICD-11 classes
21 Symptoms, signs or clinical findings, not elsewhere...
General symptoms, signs or clinical findings
General symptoms
Pain
MG31 — Acute pain
MG31.1 — Acute headache, not elsewhere classified

ICD-11 MG31.1 — Acute headache, not elsewhere classified

The diagnosis has no description.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.